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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e4dd2ca8d02a6dff18bb2e7a7a2e2df0534e5196dcf9f774284f711770f5aa' 
  AND token = 'kWwbwmNgn8dW5joKL6AAsP0gGzepba35BrMuTV/f0a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}